humidity in a rack?

How do you keep up himidity in a rack system? Im building one this week and Im just curious. Is it something Im going to have to mist everyday or what? Keep in mind I live in Las Vegas where the humidity is usually around 10-20% and humidifiers in the rooms dont really boost it up much.

Racks have lower air circulation compared to tanks. So your 10-20% should turn into 30% with just switching to tubs. Using Cyprus mulch in the tubs should fix the rest or mist when needed.

When you set up your tubs for the rack, check the humidity levels before putting holes in the tubs, then add holes to tubs accordingly til you get the right humidity level.